Electrical condenser



Aug. 11, 1931. s. L. LANG ELECTRICAL CONDENSER Filed May l7 192 mvmron GEORGE L AAA/6 A onuey 0/41. 0/ v/s/a/vs Patented Aug. 11, 1931 UNITED STATES GEORGE I. LANG, SOUTH ORANGE, NEW JERSEY ELECTRICAL SE8 Application fled Kay 17, 1926. Serial 170.108,!18.

This invention relates to improvements in an electrical condenser of the type which is v specially suited for use in radio circuits.

Variable condensers for radio purposes are usually constructed of a group of fixed plates, known as the stator and a group of rotatable plates known as the rotor, on the r shaft of which is mounted an operating dial, which is also utilized to indicate the position of the rotor or the setting of the condenser.

On account of variations in manufacture, not only of the condensers themselves, but the construction of the transformers or inductance coils etc., with which the condensers are associated it is practically impossible to have a lurality of condensers assembled in a radlo set, which will always time its respective circuit to the maximum with the same dial setting.

Where condensers are arranged in tandem or parallel and connected so as to be operated by one dial, or unit control it is at once apparent that unless each con enser tunes its respective circuit to the proper E oint, inferior results will be obtained.

his difliculty can not even be overcome by matching the condensers of a given set, as the variations in the inductance coils and transformers and the wiring in the set changes conditions.

It is therefore the principal object of my invention to provide a condenser which ma be used with a unit or single dial contro with the assurance that all of the condensers connected to the one control will tune its respective circuit to the maximum for each setting of the dial.

Another object of my invention is to rovide a condenser which, while accomp 'shing the principal object is relativel simple and cheap to construct and one whic is easy to adjust.

Other ob'ects of my invention will be apparent a ter a study of the specification taken in connection with the annexed drawing, wherein: I

igure 1 is a plan view looking down on the condenser, showin the rotor and stator plates in full cooperation but with the rotor ported in bearing bushin plates carried to one position of operation y the compensating device.

Figure 2 1s a view of the rear of the condenser showin the adjusting means carried on the part 0 the framework of the condenser.

Figure 3 is a view on the line 33 of Figure 1, showing the compensating device carried on the framework.

Figure 4 is a view of the stator and rotor plates with the rotor turned 90 (ninety degrees) from the position shown in Figure 1, wherein the rotor lates are in a different relative position wit plates.

Fi re 5 is an enlarged view of a modified cm of contact arm, used between the' rotor and the compensating device, while,

Figure 6 is a curve showmg the maximum and minimum capacities attainable as well respect to the stator I as a variable intermediate curve which may be obtained by the compensating means.

Referring now to the draw-1n s wherein like numbers refer to correspon g parts,

in the various viewszl illustrates a plate,

comprising a group of similar stator plates that are carried by the lugs 2 and 3, usually of metal, and which are attached to insulating strips 4 and 5, carried between the end plates 6 and 7 which comprise the framework of the condenser.

The plates 6 and 7 are further held in position by the, spacing studs 8, 9 and' 10. 11 is'one of the lates of the rotor group which are mounted in the metallic hub 12, in any: satisfactory manner.

he hub 12, is carried on a shaft 13, sup- 14 and 15, carried respectivelyin the ates 7 and 6. On the outer end of the she 13, is carried the usual control dial 16. 17 illustrates the mounting panel on which the condenser is mounted in any well-known manner. The shaft 13, carries a sprin 18, between the end of the hub 12, and t ebushing 15, the purpose of which spring will be hereinafter ex ained. v

ounted on the frameplate 7, is a member 19, having lugs 20, three bein illustrated, which are bent downward an attached to the plate, in any well-known manner, as by rivets 21. Engaging the outer rim 22 of the member 19, is a series of adjusting screws 23, only two of which are shown in Figure 1, but which are more clearly illustrated in Fig ures 2 and 3. The ends of the screws 23,

' are provided with enlarged heads 24, havin annular grooves 25, therein, within whic grooves, is positioned the edge 22 of the member 19. The screws 23 are arranged on the plate 7 arcuately, as shown in Figures 2 and 3.

The member 19, is preferably made of hard resilient metal and engaging it is a contact member 26, carried on the end of an arm 27, which is fastened to the rotor structure as by set screws 28.

In the form shown in Figure 5, the contact member 26 may carry a hardened ball 29.

The member 19, is preferably provided with stop lugs 30 and 31, at each end, so that the contact member 26 cannot be moved off themember 19.

From the construction above describedit is to be understood that the spring 18, continuously urges the rotor in a direction so as to press t e contact member 26 into engagement with the member 19. Now by adusting the position of the various screws 23, the member 19 may be caused to take a varying wave line position so that as the rotor is turned the group of rotor plates is moved laterally forward and back with respect to the stator plates, consequently it is possible to adjust the compensating member 19, so as to produce a capacity curve 32, which is a maximum; or a curve 33, which is a minimum or an irregular curve 34, which is anywhere in between curves 32 and 33.

The compensating means provides an adjustment of the capacity of each condenser so that a plurality of condensers, having been mounted in a receiving set, they may be adjusted to give maximum tuning effect, for the same dial reading, after which the unit or common control mechanism is connected.

From what has been said it will be apparent that the details for carrying into efiect the principle of my invention may be varied to considerable extent I therefore do not wish to be unduly limited in the interpretation of the appended claims.

Having thus described my invention, what I claim. is

1. In an electrical condenser having a group of stator plates and a cooperating group of rotor plates with means for rotatably adjusting the angular phsition bethe stator and rotor plates and means independently adjustable at difi'erent points at will for varying automatically the lateral position of one group of said plates with respect to the other for the purpose descrlbed.

2. In an electrical condenser having a group of stator lates and a cooperating group of rotor p ates with means for rotatably adjusting the angular position between the stator and rotor plates and means independently adjustable at different points at will for varying automatically the lateral position of the rotor group of plates with respect to the stator group for the purpose described.

3. In an electrical condenser having a group of stator plates and a cooperating group of rotor plates carried on an operating s aft supported by a framework, a member adjustably carried on the framework, an arm rotatably carried by said shaft and rotor adjacent the rotor plates, a contact member carried by the arm, and engaging said adjustable member and a spring associated with the rotor for continually urgin the rotor laterally in one direction towar the stator and the contact member into engagement with said adjustable member.

4. In an electrical condenser having a group of stator plates and a cooperating groupl of rotor plates carried on an operating s aft supported by a framework, a compensating member carried on the framework, means for changing the distance between the compensating member and the frame at various points arcuately spaced apart, an arm rotatably carried by said shaft and rotor adjacent the rotor plates, a contact member carried by the arm and engaging said compensatin member and a spring associated with t e rotor for continually urging the rotor laterally in one direction toward the stator and the contact member into engagement with said compensating member.

5. In an electrical condenser having a group of stator plates and a cooperating group of rotor plates carried on an operating shaft supported by a framework, a compensating member carried on the framework, a plurality of adjustable studs arouately arranged on the frame and engaging said compensating member whereby its surface in proximity to said stud may be shifted with respect to the frame; an arm rotatablly carried by said-shaft and rotor adjacent t e rotor plates, a contact member.carried by the arm and engaging said compeneating member and a spring associated with the rotor for continually urging the rotor laterally in one direction toward the stator and the contact member into engagement with said compensating member.

6. In an electrical condenser having a group of stator plates and a cooperating grou of rotor plates carried on an operating s aft supported by a framework, a compensating member carried on the framework, a plurality of studs screw threaded through emma 3 the framework and each having an enlarged head with an annular groove therein for engaging the edge of said compensating member whereby its surface in proximity to 5 said stud may be shifted with res ect to the frame, an arm rotatably carrie by said shaft and rotor adjacent the rotor plates, a i contact member carried by the arm and engaging said compensating member and a spring associated with the rotor for continually urging the rotor laterally in one direction toward the stator-and the contact member into engagement with said compensating member.

In an electrical condenser having a group of stator plates and a cooperating grou of rotor plates carried on an operat- 1ng s aft supported by a framework, a spring acting on the rotor for urging it laterally in one direction with respect to the stator,

a compensating member on the framework, means associated with said member for independently shifting different portions of it with respect to the framework and means acting between the rotor and said member for resisting the action of the spring as and forthe purpose described.

8. In an electrical condenser having a group of stator plates and a cooperating 3o grou of rotor plates carried on an opera-tmg s aft supported by a framework, a compensating member on the framework and adustable means associated therewith for producing a variable contour of the surface of said member and means carried by the operatin shaft adapted to follow the contour of sai compensatlng member, as and for the purpose described. a

In testimony whereof, I aflix my signao ture.

GEORGE L. LANG. 

